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Related Concept Videos

Mate Choice01:20

Mate Choice

12.0K
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
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Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

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The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing,...
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Types of Selection01:46

Types of Selection

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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Genetics of Speciation02:16

Genetics of Speciation

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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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Assessing Differences in Sperm Competitive Ability in Drosophila
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Identifying signatures of sexual selection using genomewide selection components analysis.

Sarah P Flanagan1, Adam G Jones1

  • 1Biology Department, Texas A&M University 3258 TAMU, College Station, Texas, 77843.

Ecology and Evolution
|August 11, 2015
PubMed
Summary

Detecting genomic signatures of sexual selection is challenging. Genome-wide selection components analysis effectively identifies loci under selection, even with moderate sample sizes, by comparing allele frequencies between life stages.

Keywords:
AdaptationRAD-seqpopulation geneticspopulation genomicsreproductive successsimulation model

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Area of Science:

  • Evolutionary genetics
  • Population genetics
  • Genomics

Background:

  • Detecting genomic signatures of sexual selection is crucial for understanding its evolutionary impact.
  • Current methods often require prior knowledge of traits under selection, limiting broad applicability.

Purpose of the Study:

  • To investigate the utility of genome-wide selection components analysis (GSCA) for detecting sexual selection.
  • To assess the feasibility of GSCA without a priori trait information.

Main Methods:

  • An individual-based model of a diploid, sexually reproducing population was used.
  • Strong mate choice on a quantitative trait was simulated to model sexual selection.
  • Genome-wide allele frequencies in adults and offspring were compared using weighted FST values.

Main Results:

  • GSCA successfully detected signatures of strong sexual selection, even with moderate sample sizes.
  • Increased sample sizes and a higher density of neutral markers improved detection rates.
  • Selection detection remained feasible despite environmental variation and was enhanced by sampling multiple populations.

Conclusions:

  • Genome-wide selection components analysis is a viable, albeit challenging, method for identifying genomic regions under selection.
  • GSCA offers a powerful tool for uncovering the genomic basis of sexual selection without prior trait knowledge.